E6-B Menu - Garmin GPS 90 Owner's Manual & Reference

The Main Menu page also provides access to the GPS
9 0 ' s E6-B functions, which can be used to calculate
density altitude, winds aloft, fuel usage, sunrise & sunset
and vertical navigation profiles.
To calculate density altitude and true air speed:
1. Highlight the indicated altitude field (IAlt) and press
2. Enter the altitude from your altimeter and press
E
3. Press to begin entry of your calibrated airspeed
(CAS).
4. Enter the calibrated airspeed and press
E
5. Press to begin entry of your current altimeter setting.
6. Enter the altimeter pressure and press
E
7. Press to begin entry of the total air temperature (TAT).
8. Enter the TAT (standard outside air temperature gauge on
most piston aircraft) and press the
The calculated density altitude and true airspeed will
be displayed at the bottom of the page.
The GPS 90 winds aloft function will calculate the
wind direction, speed and head/tail wind conditions for
you from by entering your true air speed and curre n t
heading.
To calculate winds aloft:
1. Highlight the true airspeed field (TAS) and press
2. Enter the TAS (use the density altitude function if you do not
know TAS) and press
E
3. Press to begin entry of your current heading (Hdg).
4. Enter your heading and press
The wind direction, speed and the head/tail wind
conditions will be displayed at the bottom of the winds
aloft page.
E
.
E
.
E
key.
E
.
E
.
E
.
E
.
E
.

E6-B Menu

Density Altitude
& Winds Aloft
Calculating density
altitude and true
air speed.
Calculating winds
aloft.
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